docs: def pip_execute(*args, **kwargs):
      """Overriden pip_execute() to stop sys.path being changed.
  
      The act of importing main from the pip module seems to cause add wheels
      from the /usr/share/python-wheels which are installed by various tools.
      This function ensures that sys.path remains the same after the call is
      executed.
      """
      try:
          _path = sys.path
          try:
              from pip import main as _pip_execute
          except ImportError:
              apt_update()
              if six.PY2:
                  apt_install('python-pip')
              else:
                  apt_install('python3-pip')
              from pip import main as _pip_execute
          _pip_execute(*args, **kwargs)
      finally:
          sys.path = _path